21660546366163 has 2 divisors, whose sum is σ = 21660546366164. Its totient is φ = 21660546366162.

The previous prime is 21660546366079. The next prime is 21660546366169. The reversal of 21660546366163 is 36166364506612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21660546366163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21660546366169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830273183081 + 10830273183082.

It is an arithmetic number, because the mean of its divisors is an integer number (10830273183082).

Almost surely, 2^{21660546366163} is an apocalyptic number.

21660546366163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21660546366163 is an equidigital number, since it uses as much as digits as its factorization.

21660546366163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16796160, while the sum is 55.

The spelling of 21660546366163 in words is "twenty-one trillion, six hundred sixty billion, five hundred forty-six million, three hundred sixty-six thousand, one hundred sixty-three".